Discovery I (LJ) V8-4.0L (1996)
Technical Service Bulletin # TEC190397
Date: 970627
VSS - DTC P0500 Set, Engine Misfire
06/27/97
19/03/97/NAS
SUBJECT
PRIDE - Road Speed Transducer Fault Diagnosis
MODEL
Discovery
AFFECTED VEHICLES
LP
LH
LJ
1996-1997 MY
LD
DETAIL
The roadspeed transducer, Vehicle Speed Sensor, (VSS) is a reed type switch that is opened and closed by a rotating magnet driven by the transfer box
Output shaft. The signal from the VSS switches from battery voltage to 0 volts each time it opens and closes. This happens 8000 times per mile or
approximately every inches of vehicle movement. The signal, viewed on an oscilloscope, is a simple square wave pattern. This TIB discusses two
problems related to VSS fault:
^
P-code P0500 VSS Fault
^
Misfire caused by intermittent VSS
The diagnostic steps and repair procedures detailed on the following pages were developed as an element of the Land Rover Way OPERATION PRIDE,
This TIB provides a library location for PRIDE information within the Land Rover North America technical literature system.
ACTION REQUIRED
Upon customer complaint for the symptoms outlined, perform the specified repairs.
PARTS INFORMATION
Required Parts:
AMR1253 - Roadspeed Transducer (VSS)
Required Tools:
Snap-on(R) P.A.C.
PROCEDURE
TestBook
1.
Hook up TestBook and follow directions to retrieve fault codes.
2.
Complete a DTCR along with freeze frame data and FAX to LRNA.
3.
Follow diagnostic directions from TestBook in order to locate problem.